ManTech Schedules First Quarter Fiscal Year 2013 Earnings Release And Conference Call For May 1, 2013

ManTech International Corporation (NASDAQ: MANT) will issue its first quarter fiscal year 2013 earnings press release after close of market Wednesday, May 1, 2013. Management will discuss financial results in a conference call beginning at 5 p.m. Eastern.

Analysts may participate in the conference call by dialing 877-638-9567 (domestic) or 253-237-1032 (international) and entering pass code 23904953 . The conference call will be webcast simultaneously to the public through a link on the Investor Relations section of the ManTech website ( http://investor.mantech.com). A replay of the conference call will be available on the ManTech website approximately 2 hours after the conclusion of the call.

About ManTech International Corporation

ManTech is a leading provider of innovative technologies and solutions for mission-critical national security programs for the intelligence community; the Departments of Defense, State, Homeland Security, Energy and Justice, including the Federal Bureau of Investigation (FBI); the health and space communities; and other U.S. federal government customers. We provide support to critical national security programs for approximately 50 federal agencies through approximately 1,000 current contracts. ManTech’s expertise includes command, control, communications, computers, intelligence, surveillance and reconnaissance (C4ISR) solutions and services; cyber security; global logistics support; information technology (IT) modernization and sustainment; intelligence/counter-intelligence solutions and support; systems engineering; test and evaluation; environmental, range and sustainability services; and healthcare analytics and IT. ManTech supports major national missions, such as military readiness and wellness, terrorist threat detection, information security and border protection. Additional information on ManTech can be found at www.mantech.com.